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Compatible SpectrumsFollowing some recent coding exploits I've been thinking about compatibility of various models of ZX Spectrum. Yes, it's a common question on the for…
... all... due to the memory contention issues. The +2a/+3 had ... also the issue of different contention timings to the "original" models ... can't change the hardware contention, surely.
Of ... -
FPGA Spectrum is aliveMy FPGA Spectrum that I started to work on year ago is in 90% ready. I have fixed DDR controller so I can read from it and write to it. I've run som…
... lack are the problems with contention model (model because for videoram ... -
Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…
Fuse for Mac OS X 0.9.0 ReleasedA new version of Fuse for Mac OS X has been released at the dedicated sourceforge project and shortly here on WoS: [url]http://sourceforge.net/proje…
... emulation (Q-Master).
[*] Fix contention for LD?R, CP?R ... (Stuart Brady).
[*] Separate out contention when MREQ isn't active ... the +2A/+3 ULA applies contention only when MREQ is active ...Fuse for Mac OS X 0.10.0 ReleasedA new version of Fuse for Mac OS X has been released at the dedicated sourceforge project and shortly here on WoS: [url]http://sourceforge.net/proje…
... (but probably not perfect) TS2068 contention (Philip Kendall).
[*] Various other ...Fastest way to clear a screen.We haven't had an optimizing fun for some time, so let's have some: What's the fastest way to clear a screen (i.e., filling the 6912 bytes at 16384 w…
... let's ignore the memory contention.
To start with ...Some ever noticed that +2A/+3 halts Z80 using WAIT?I mean: Anyone ever noticed that the +2A/+3 halts the Z80 using WAIT? All documentation I've read about contention state that the ULA halts the Z80 …
... documentation I've read about contention state that the ULA halts ... at the screen RAM, so contention should be strong here.
CPI emulationI'm currently writing Sinclairean's emulation assembly for the CPI/CPD/CPIR/CPDR instruction group. Does anybody know what exactly the behavior of th…
... write should be checked against contention.iXpectum 1.2 HD (iPad enabled) is out!iXpectrum now supports iPad on jailbroken devices ;) Thanks to Ryosaebaa for his support... You can download by now at: [url]http://code.google.co…
... ones).
- Fixed flags and contention in IND,INDR,INI,INIR ... ,OTDR instructions.
- Improved port contention emulation.
- Only read AY ...Memory mapping: Pentagon compatibility?I'm writing something that will rely heavily on the Spectrum's ability to switch screen buffers in hardware (port 0x7FFD). The original Spectrum 128K…
... 16K bank pageable) and the contention timings on port 0x7FFD are ...Will the real, *Darth Vader* please stand up.Well, with all this [I]Matrix/Terminator[/I] dispute going on, I was reminded of a [I]Star Wars[/I] contention, with Bob Anderson's claim as being th…
... a [I]Star Wars[/I] contention, with Bob Anderson's claim ...contended memory...so memory contention on the toastrack and the grey +2 is in the wrong place compared to the documentation, yet the +2a/b and +3 it is in the correct …
so memory contention on the toastrack and the grey +2 is in the wrong place compared to the documentation, yet the +2a/b and +3 it is in the correct place
can it be altered on the toastrack and grey +2 to match the the +2a/b and +3?Contention: LDI vs LD (ss), rAccording c.s.s. FAQ: instruction LD (ss),r breakdowns as pc:4,[b]ss:3[/b] and LDI as pc:4,pc+1:4,hl:3,[b]de:3,de:1 x 2[/b] can anyone explain why …
According c.s.s. FAQ:
instruction LD (ss),r breakdowns as pc:4,[b]ss:3[/b]
and LDI as pc:4,pc+1:4,hl:3,[b]de:3,de:1 x 2[/b]
can anyone explain why WRITE operation in LDI introduces two delays? or that [b]de: 1x2[/b] means ...Emulating the 128KeIt occurs to me that I wasn't frequenting WoSf when I created the 128Ke standard, which means some people haven't heard of it. Here it is: [url]http…
... IF2). Software written for correct contention that crashes the original 128 ...Upgrading the Humble Spectrum 128 +2 (Grey)Hello there my fellow WoS'ers I am at a subtle in-pass in my wants for one of my +2 motherboards. I received this mobo, DOA in a job lot from fleab…
... . The ability to switch memory contention modes (128k / +2A/B)[/B ... 128K to the Amstrad memory contention model sing a simple GAL ...ZX Spectrum 48K clone and test resultsHi! This is my first post, so, first of all, I'd like to say hello to the whole community! I am Alessandro Dorigatti from Italy and I'm developing …
... . some tests in FuseTests, IR-Contention) and others show some glitches ... : Fusetest is OK, IOcontention OK, contention OK, Float48K OK, FloatSpy OK ...ZXMMC+ emulation added to Z80p48K emulator for the V6Z80p+Hi friends! As time ago I've posted a thread about an FPGA clone for the V6Z80p board, I'd like to give an update about the status of the project. …
... , 14MHz (experimental). The original ULA contention algorithm is always applied. The ...Best game ever?Not sure the best way to do this, thinking top 10s with a sliding scale of 10 points awarded to the game you vote 'best' down to 1 point for your 10t…
... and Soccer Boss in serious contention. I think DTST and Emlyn ...New software screenmode: aSmpI was planning to release this tool at Forever XIII, but they didn't accept it, this is my 30th year activity, my most ambitious work on zx spectrum …
... project made me understand how contention works, learned too many opcodes ...28-character wide multicolour(ish) on 48k SpectrumLong-time lurker here... I've always been interested in rainbow effects on the 48k Spectrum, mainly from a perspective of "Just what [I]would [/I]ha…
... crazy the moment the contention-free period starts. We ... mess around with the contention, so maybe you could ... at the start of the contention-free period
... at the start of the contention-free period
... the start of the contention-free period
...ULAPlus: showing different screen modes in one screenI wanted to write a demo showing the same screen, converted to various screen modes available on the Spectrum (well, a Spectrum clone capable of show…
... IORQ signal, thus confusing the contention handler.
I've ...Fusetest port 0x7FFD test resultsHi, I'm adding the Spectrum 128K emulation to my FPGA core running on the V6Z80p platform. I'm doing some tests; running Fusetest, the machine is se…
Robocop 3 and Spectrum 128K toast-rackHi all, we are going on with the tests on the new 128K emulator for the V6Z80p board, and we have found something odd: Robocop 3 (designed for the 12…
... does port accesses creating IR contention (as, if we are right ...fixing the economyDear Mr. Cameron, Please find below our suggestion for fixing the UK 's economy. Instead of giving billions of pounds to banks that will squander t…
JSSpeccy v2.0 releasedI'm pleased to announce version 2.0 of JSSpeccy! [url=http://jsspeccy.zxdemo.org/]Online version[/url] [url=https://github.com/gasman/jsspeccy2]Sour…
... unit tests, including memory/port contention, which means...
- 99% accurate ...Zymosis -- WTFPL'ed Z80 Emulation Corebreaking news! i'm back with another useless project: new Z80 emulation core written in pure C! i hear you screaming: "oh, no! WHY?!" let me tell yo…
... if it is really does contention and other things right; for ...A new ZX spectrum cloneOver the past 12 months i have been developing a new spectrum clone as a hobby project to waste my spare time on. It is still not fully complete yet …
... timings
Floating bus and contention emulation model (not cycle accurate ... the border shows up the contention model inaccuracy.
Things ... the BASIC extensions
Improve contention model to match standard 48K ...OpenSE BASIC disassembly?The [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0027510"]OpenSE BASIC[/URL] page provides a source code listing, however it doesn't really…
... as evidence to support the contention that OpenSE BASIC is a ...Revisiting Spectrum CPU clock regenerationWarning: This post will be a bit nerdy :-) Some time ago, I experimented with phase locked loop circuits as a possible way to regenerate the Spectru…
... 's clock signal despite contention. However, if the ... clock after contention. There's no contention cycles visible here ... Spectrum clock cycles since contention started, and one counting ... regenerated clock cycles since contention started.
...
